all the other gears work, 1,2,3,5.

going about 115mph at 7grand and then 4th gear took a crap.
i can shift into 4th gear but the car just revs up as if it was in neutral.
anyone had any problems like this. i know that the poblem will be pretty obvious when i pull the tranny apart. but just wondering what it might be. thanks

 

ok, 4th gear is sheared. no teeth left
1st and 2nd gear are about to go too. there's only a few teeth left.

over 500hp.